<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>IE缓存问题</title>
    <style>
      .result {
        width: 200px;
        height: 100px;
        border: 1px solid #90b;
      }
    </style>
  </head>
  <body>
    <button>发送请求</button>
    <div class="result"></div>

    <script>
      const btn = document.querySelector("button");
      const result = document.querySelector(".result");

      btn.addEventListener("click", function () {
        const xhr = new XMLHttpRequest();
        // 解决IE缓存问题的关键 为地址添加一个变化的参数
        xhr.open("GET", "http://127.0.0.1:8080/ie?t=" + Date.now());
        xhr.send();
        xhr.onreadystatechange = function () {
          if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300) {
              result.innerHTML = xhr.response;
            }
          }
        };
      });
    </script>
  </body>
</html>
